Voucher/ˈvaʊtʃər/ Definition 1 of 3Pro Tip 1/3Promotional Tool Vouchers are often used to attract customers with discounts or free offers. The coffee shop distributed vouchers for a buy-one-get-one-free deal. Pro Tip 2/3Limited Validity Vouchers usually have an expiration date after which they cannot be used. Remember, the gift voucher is only valid until the end of this month. Pro Tip 3/3Transferability Some vouchers can be given to another person, but others might be non-transferable. My aunt couldn't use her voucher, so she passed it on to me.